You can fly this itinerary in J for $6,200 on AC which nets you well over 4,000PQD. It requires positioning to DEN though. Dates are close to what you want.
DEN-YVR-ICN-TFU

https://www.google.com/travel/flight...RJHkoZFSY7b9b8

There are also BR flights SFO/IAH/LAX-TPE-TFU for $5,700 in J. But that only nets you around 2,450PQD roundtrip. So you'd have to spend more on your positioning flight or find some other creative routing to get to your 3,500PQD target.